The mathematical genius Alan Turing was responsible for cracking Germany's Enigma Code - enabling the Allies to decipher messages sent by the Nazis to their forces. Derek Jacobi, Prunella Scales, Richard Johnson, Amanda Root and Harold Pinter star in this absorbing drama, revealing how one of Britain's greatest mathematicians changed the course of the Second World War.
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Ready to Watch A Night of Numbers, Season 1, Episode 4?